Just one screen frozen
I just had a screen freeze. It was the fourth screen. The apps on all the other screens worked fine. I even unlocked the apps to move them and just this screen didn't go into the jiggle mode. I was able to fix by shutting done and restarting. Anyone else had this happen?
Don't worry about it too much. Like any computer the iPad is subject to some 'unexplained' issues that occur occasionally. I've had similar 'problems' with mine too but the restart that you did solved mine as well. Only start to worry if the problem recurs frequently.
Otherwise, enjoy your iPad.